Chemical Engineering MCQs

Page No. 316

Desirable “Micum Index” values of metallurgical coke are ___________________?


aM40 > 78% and M10 < 10%

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bM40 > 4% and M10 10% and M10 98% and M10 < 2%

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cBoth A. & B.

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dNone of these

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Which of the following fuels is the best for burning on chain grate stoker ?


aNon-caking coal

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bCaking coal

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cCoking coal

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dPulverised coal

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View Answer Non-caking coal

“Overfire burning” in a furnace is a phenomenon characterised by the __________________?


aSupply of excess fuel

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bSupply of excess air

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cBurning of carbon monoxide and other incombustibles in upper zone of furnace by supplying more air

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dNone of these

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A coal gasifier operating at 20 atm. (e.g. Lurgi gasifier) as compared to one operating at atmospheric pressure (e.g. Kopper-Totzek or Winkler gasifier) will produce a gas having _____________________?


aHigher methane content and thus higher calorific value

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bHigher carbon monoxide content

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cLower carbon dioxide content

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dNone of these

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For every 10% increase in the excess air; the fuel consumption increases by _______________ percent?


a0.1

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b0.2

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c0.5

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d1.0

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View Answer 0.1

Main use of hard coke produced by high temperature carbonisation is in the ____________________ ?


aIron blast furnace

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bCupola in foundries

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cSinter making

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dDomestic ovens

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View Answer Iron blast furnace

Percentage of carbon monoxide in blast furnace gas may be around ____________________ ?


a8

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b14

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c22

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d52

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View Answer 22

Which is the most matured coal ?


aLignite

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bBituminous

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cSemi-anthracite

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dAnthracite

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View Answer Anthracite

Pitch creosote mixture (PCM) as compared to furnace oil is a better fuel, because its ___________________?


aEmissivity factor is higher

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bSulphur content is lower

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cFlue gas has lower dew point thereby facilitating more waste heat recovery

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dAll A., B. and C.

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View Answer All A., B. and C.

Incomplete combustion of a fuel is characterised by the high _______________ in the flue gas?


aSmoke

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bTemperature

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cOxygen

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dCarbon monoxide

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View Answer Carbon monoxide

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